$ certok -h
certok - A tool to check the validity and expiration dates of SSL certificates.Usage: certok <command>Flags:-all Show entire certificate chain,not just the first.(default:false)-d enable debug logging (default:false)-days Warnif the certificate will expire within this many days.(default:0)-months Warnif the certificate will expire within this many months.(default:0)-years Warnif the certificate will expire within this many years.(default:0)Commands:
version Show the version information.